AQA Jun 2014 Paper 1 Q4

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do not write outside the box a ammonia gas readily condenses to form a liquid when cooled a i name the strongest attractive force between two ammonia molecules mark a ii draw a diagram to show how two ammonia molecules interact with each other in the liquid phase include all partial charges and all lone pairs of electrons in your diagram marks b ammonia reacts with boron trichloride to form a molecule with the following structure n b h h h cl cl cl state how the bond between ammonia and boron trichloride is formed mark wmp jun chem do not write outside the box c table shows the electronegativity values of some elements table electronegativity li c i give the meaning of the term electronegativity marks c ii suggest the formula of an ionic compound that is formed by the chemical combination of two different elements from table mark c iii suggest the formula of the compound that has the least polar bond and is formed by chemical combination of two of the elements from table mark turn over for the next question turn over wmp jun chem do not write outside the box a some oil fired heaters use paraffin as a fuel one of the compounds in paraffin is the straight chain alkane dodecane c h give the name of the substance from which paraffin is obtained state the name of the process used to obtain paraffin from this substance marks substance process b the combustion of dodecane produces several products write an equation for the incomplete combustion of dodecane to produce gaseous products only mark c oxides of nitrogen are also produced during the combustion of paraffin in air c i explain how these oxides of nitrogen are formed marks c ii write an equation to show how nitrogen monoxide in the air is converted into nitrogen dioxide mark c iii nitric acid hno contributes to acidity in rainwater deduce an equation to show how nitrogen dioxide reacts with oxygen and water to form nitric acid mark wmp jun chem

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